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But Kevin and Christine Fuller, the parents of Matthew Fuller who died in October 2009, say Mr Rudd is yet to respond to their July 20 letter despite promising to meet with the grieving families.

"That was well over a month ago and he has not been able to fit it in to his busy campaigning schedule, or to make it make it any sort of priority to have any meeting with the families," Mr Fuller told News Corp.

The prime minister will begin the day in the Victorian capital, where Labor is hoping to save marginal seats Corangamite, Deakin and La Trobe, and win back the Greens-held seat of Melbourne.

Mr Abbott will visit the Royal Queensland Show in Brisbane, better known as the Ekka.

The two leaders will face off in the first campaign debate at the National Press Club in Canberra on Sunday.

Former Liberal prime minister John Howard will visit the NSW seats of Dobell and Robertson with Liberal senator Arthur Sinodinos.